Method of making stay bolts



Nov. 18, 1924.. 1,516,007

J. A. FRAUENHEIM METHOD OF MA'KlNG STAY BOLTS Original Filed May 51, 1918 2 Sheets-Sheet 1 Patented Nov. 18, 1924.

FLEXIBLE BOLT COMPANY, (DE EL PENNSYLVANIA.

To all whom it may concern:

Be it known that I, Josnrrr A. Farmin- HniM, residing at Zelienople, in the coin t y of Butler and State of Pennsylvania, have invented a new and useful improvement in Methods of Making Stay Bolts, of which the following is a full, clear, and exact description, referencebeing had to the accoinpanying drawings, forming part of this specification, in which Figure 1 is a plan view showing the initial form of blank used in the manufacture or my improved stay bolts;

Figure 2 is a plan View of the same after it has been subjected to the action of the first roll pass;

Figure 3 is a similar view oi end por tion oi" the blank through an. angle of 90 from the position shown in igure 2;

Figures 4 and 5 are sect-ions taken, respectively, on the lines lVl and V-V of Figure 3;

Figure 6 is a longitudinal sectional View of the blank after it has been roll-finished and drilled;

Figure 7 is a plan view of the completed bolt;

Figure 8 is a transverse vertical section through the rolls employed; and

Figure 9 is a longitudinal vertical section showing the form of the two roll passes.

My invention has relation to stay bolts and the manufacture thereof, and is designed to provide stay bolt comprising a body portion and integral heads, the body portion being of reduced diameter and united to the head by tapered portions oi a frustoronical form, said body and tapered portions being roll-shaped and finished.

My invention is also designed to provide a simple and practicable method by which bolts of this character can be readily shaped from an initial blank by rolling operations. My invention may be applied to the manufacture of solid or hollow stay bolts.

Referring to the accompanying drawings, the numeral 2 in Figure 1 designates the initial form of the blank which I employ. This blank is approximately cylindrical and is of a length somewhat shorter than the tr es,

Tie-non a cor-iron...

P' -HL S LVANIA,

"ne "nished bolt, inasmuch as the r operations hereinafter described an elongation of the blank.

in accordance with my invention, l: take a blank such shown in this figure, and subject it to the action of a roll. pass 3, having substantially the form shown in F gure 9; that is to say, somewhat elliptical, although having the portions 3, which are adapted to give an approximately cylindrical shape to the surface of the blank, with which they contact. This pass is formed between segmental projections 4 on a pair of rolls 5, the length of the contacting surfaces of the pass walls being sufiicient to act upon the intermediate portion only or the blank. These rolls rotate in the direction of the arrows shown in Figure 8. The pass entrances and exits are beveled, as indicated at (3, so as to give the desired shape to the tapered or irusto-conical portions of the blank. After the blank has been subjected to the action of this pass, it has the form substantiallyas shown in Figures 2, 3, 4 and its shown in these figures, its central body-forming portion 7 has been elongated and reduced in diameter, this reduced portion being slightly elliptical in cross section, a thougizh partially finished to cylindrical term by the action of the portions 8* oi the pass-forming walls. At the same time, the tapered or frusto-conical portions 8 have been partially shaped, a section through either one 01" these portions being generally such as that indicated in Figure a. it will he noted that in this figure, there are distinct ridges or fins 9 left at diametrically opposite sides of the blank. The blank is now rotated through an angle of 90, and is then subjected to the action of a second roll pass of the cylindrical form shown at 10 in Figure 9. By the action of this pass, the central body-forming portion of the blank is completely finished to cylindrical form, and the tapered portions 8 are also given their final frusto-conical form.

The ridges or fins of metal are particularly important in securing the proper action of this second pass upon the blank. Vfithout the provision of such ridges or fins, the rolls would not take hold of the partially formed i rusto-conical portion of the blank at exactly the proper point, and the consequence would be that the t or 'l rustoconi *al portions would symmetrically not be finished entirely around the bolts. By the provision or" these ridges o metal, the rolls take a bite thereon exactly the proper point, and a symmetrical finish can be made.

To insure the action of the rolls in both passes upon exactly the rig it portions oi the blank, the blank is inserted a fixed distance between the rolls by means of a pair of tongs or pincers which are shoved against a suitable stop 11. The blanks are introduced between the rolls in a direction opposite to the direction oi rotation of said rolls, and returned to the operator as the portions 41- engage and g p the blanks. This operation enables the operator to maintain his grasp on the blanks until the bolts are completed, and avoids the necessity for two operators and a rehandli s oi the articles, It also mak s it possible to complete a bolt with one heating thereof, and thereby affords a substantial saving of time, labor and cost of heating :fuel. The blanks are always inserted a fixed distance between the rolls which results in bolts of uniform size and shape.

After the blank has been roll-finished in the manner just described, it may be bored or drilled longitudinally, as shown at 12 in Figure 6, provided a. hollow bolt is de sired. in any event, its end. or head-torming portions are threaded, as'shown at 13 in Figure 7.

inasmuch as the entire external shaping portions are carried out in accordance with my invention by means oi rolls, the bolts may be readily manufactured.

This application is a continuation of my pplication Serial No. 287,405, filed May 1, 1918.

I claim:

1. The method of making reduced body stay bolts, which consists in presenting blank a fixed distance between rotatable rolls and in a direction opposite to the direction of rotation of said rolls, allowing said rolls to partially form said blank and produce fins thereon while returning it to the place of starting, and turning and again presenting said blank to another rolling pass to complete the formation of said bolt, substantially as described.

2. The method oi? rolling reduced body bolts, which consists in introducing blanks of suitable length and size tired distance between rotatable rolls and in a direction opposite to the direction of rotation of said rolls, allowing said rolls to take hold of said blanks and return same and to cause a flow oi the metal thereof in the body portion of the bolt to produce fins thereon, turning said blanks, and repeat in said operation to reduce the body porti: 1 and give the desired shape to said body portion, substantially as described.

3. The method of rolling reduced body stay bolts, which consists in introducing blanks of suitable length and size approximately that of the heads of the finished article a fixed distance between rotatable rolls and in a direction opposite to the direction oi" rotation of said rolls, allowing said rolls to take hold of said blanks and return the same and to cause a fiow of the metal thereof in the body portion of the bolt to produce fins on opposite sides of the bolt, turning said blanks, and repeating the said operation to effect removal of said fins and reduce the body portion and give the desired shape to said body portion, substantially as described.

4. In a machine for rolling reduced body stay bolts, the combination of a pair of cooperating rolls having cooperating grooves therein to produce the configuration of a bolt, one or said grooves forming an elliptical pass and the other of said grooves a circular pass, and means whereby the introduction of the blank between the rolls may be limited to a predetermined distance, said rolls being effective to form and return the introduced blank by engagement of the blank between said cooperating grooves, said elliptical pass forming definite fins on the blank adapted to properly start the blank in the circular pass, substantially as described.

In testimony whereof I have hereunto set my hand.

JOSEPH A. FRAUENHEIM. 

